To enable a user to distinguish readily a correspondence between an operation key and a window to which the operation is assigned. An information-processing device according to the present invention, on obtaining an operation signal of a particular operation key (specifying key) (S1), determines whether a focused (or selected) window exists (S2). If such a window does not exist, the information-processing device displays a window of a particular application and a soft key image corresponding to a soft key so that they are located close to each other, and focuses the window of the particular application (S6 and S7).